Timken39581/39521Tapered Roller Bearing Cone and Cup Set – 2.2500 in Bore, 4.4375 in OD, Inch Series 39500

Product Description

What this part is:

Timken 39581 / 39521 inch tapered roller bearing, supplied as the matched cone and cup. Bore Diameter: 2.2500 in (57.150 mm). Outside Diameter: 4.4375 in (112.713 mm). Overall Width: 1.1876 in (30.165 mm). Inner Ring Width B: 1.1875 in (30.163 mm). Outer Ring Width C: 0.9375 in (23.813 mm). Series: 39500. Base Number: 39581. Number Of Rows: 1. Rolling Elements: Tapered Roller. Bore Type: Straight. Bearing Material: Steel. Precision Class: Not specified. Item Weight: 1.40 kg (3.00 lb).

Decoding the designation:

39581 — the cone base number in the Timken 39500 inch tapered series, fixing the 2.2500 in bore and the roller path.

39521 — the mating cup, fixing the 4.4375 in outside diameter and the housing seat.

What these specs mean in practice:

Dynamic Load Rating: 167,000 N (37,500 lbf) at 1 million revolutions. Static Load Rating: 224,000 N (50,300 lbf). Dynamic Radial Load Rating C90: 43,300 N (9,730 lbf). Dynamic Axial Rating Ca90: 25,100 N (5,650 lbf). e Factor: 0.34. K Factor: 1.72. Y Factor: 1.77. Geometry Factor Cg: 0.107. G1 Factor: 84.3. G2 Factor: 23.7. The static rating well above the dynamic rating gives this size a large margin against standing and shock loads, which suits slow-turning and intermittently loaded shafts.

Mounting data:

Effective Center Location: -0.26 in (-6.6 mm), inside the cone backface. Max Shaft Fillet Radius: 0.310 in (7.900 mm). Max Housing Fillet Radius: 0.03 in (0.76 mm). Shaft Backing Shoulder Diameter Frontface da: 2.60 in (66 mm). Shaft Backing Shoulder Diameter Backface db: 3.19 in (81 mm). Housing Backing Shoulder Diameter Frontface Da: 4.25 in (107.95 mm). Housing Backing Shoulder Diameter Backface Db: 4.06 in (103.12 mm). Cage Location Relative To Backface Aa: 0.05 in (1.3 mm). Cage Location Relative To Frontface Ab: 0.13 in (3.3 mm).

Quantity and configuration:

Unit Quantity: 2 Pcs. One 39581 cone and one 39521 cup, supplied together as a matched single-row assembly.

Interchange guidance:

The 39581 and 39521 numbers are carried across the inch tapered roller programme by SKF, FAG, NSK, NTN, Koyo, Fersa and BCA/Bower on the same envelope. The Timken 39590A / 39521 shares this cup, this outside diameter and these ratings on a 2.6240 in bore, so it is a related size rather than an interchange. MPN Variants: 39581/39521, 39581-39521, 39581, 39521.